Blender denoise node producing black image
I'm experiencing similar issues on Blender 2.83 on Arch. I believe it to be related to a bug in OpenImageDenoise (oidn) or in the way Blender is trying to link it. I was able to fix the issue on my system by downgrading to openimagedenoise 1.1.0-1.

I'm currently investigating as to whether this issue is documented in the appropriate project, and will update this answer once I have a bug number for it.